Oxygen excess in layered lanthanide nickelates

Buttrey, D. J. ; Ganguly, P. ; Honig, J. M. ; Rao, C. N. R. ; Schartman, R. R. ; Subbanna, G. N. (1988) Oxygen excess in layered lanthanide nickelates Journal of Solid State Chemistry, 74 (2). pp. 233-238. ISSN 0022-4596

Full text not available from this repository.

Official URL: http://linkinghub.elsevier.com/retrieve/pii/002245...

Related URL: http://dx.doi.org/10.1016/0022-4596(88)90350-7


Density measurements on large single-crystal specimens of La2NiO4+δ and Pr2NiO4+δ show that oxygen nonstoichiometry arises from the presence of excess lattice oxygen. X-ray photoelectron spectra as well as X-ray absorption edge studies provide no evidence for the existence of Ni3+ in these oxygen-excess nickelates under the conditions of the measurements. Transmission electron microscopy has revealed a novel type of exsolution process of the stoichiometric phase out of nonstoichiometric La2NiO4 during heating in CO2 at 870 K for 3 h. An interpretation of the results in terms of the existence of peroxide species within the conducting layers is proposed.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:13772
Deposited On:12 Nov 2010 14:45
Last Modified:31 May 2011 09:53

Repository Staff Only: item control page